<< Anyway, about 3 weeks ago I noticed that her vulva was swollen. We took
her to the vet who did some blood work. She didn't get enough for an
estrogen reading for the lab but the white blood count and all that was
normal. We can either take blood again or do exploratory surgery to see if
she is adrenal or what >>

Well, that's up to you, really. In my practice, I can often feel an enlarged
adrenal gland, so ask your vet if she's feeling anything like that.
Personally, I've had more luck just going ahead with surgery if I suspect
adrenal disease than sending the bloodwork out. But that's my experience.
Either way, you're right, you don't want to wait on this, as adrenal disease
(the more likely diagnosis) can do some harm, and can often be cured with
surgery, especially in a fairly young ferret.